error when using diff() on trigonometric functions
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Hello,
When i try to apply this in matlab:
syms x
diff(cos(x))
I get :
ans =
diff(cos(x), x)
Instead of -sin(x) as expected. The examples and help show that it should work for trig functions and I don't understand why this isn't working for me.
Is this a kind of bug? Has anyone encountered this before?
Thanks, Alex
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